Texas Instruments TI-89 Manual Book page 279

Selecting the
Calculation Type
(Continued)
From the Home
Screen or a Program
262 Chapter 16: Statistics and Data Plots
Calc Type Description
Median-Median — Fits the data to the model
MedMed
(where a is the slope, and
median-median line, which is part of the resistant line
technique.
Summary points
and medy3
they are not displayed on the
PowerReg Power regression — Fits the data to the model equation
b
using a least-squares fit and transformed values
y=ax
ln(x) and ln(y)
Quadratic regression — Fits the data to the second-
QuadReg
order polynomial
three data points.
¦
For three points, the equation is a polynomial fit.
¦
For four or more points, it is a polynomial regression.
Quartic regression — Fits the data to the fourth-order
QuartReg
polynomial
least five data points.
¦
For five points, the equation is a polynomial fit.
¦
For six or more points, it is a polynomial regression.
Sinusoidal regression — Calculates the sinusoidal
SinReg
regression and updates all the system statistics
variables. The output is always in radians, regardless of
the angle mode setting.
Use the applicable command for the calculation that you want to
perform. The commands have the same name as the corresponding
. Refer to Appendix A for information about each
Calculation Type
command.
Important: These commands perform a statistical calculation but
do not automatically display the results. Use the
to show the calculation results.
b is the y-intercept) using the
, ,
medx1 medy1 medx2
are calculated and stored to variables, but
STAT VARS
.
y=axñ +bx+c . You must have at least
4
y=ax +bxò +cxñ + dx+e
y=ax+b
, , ,
medy2 medx3
screen.
. You must have at
ShowStat command